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+/* Parameters for execution on VxWorks 68k's, for GDB, the GNU debugger.
+ Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
+ Contributed by Cygnus Support.
+
+This file is part of GDB.
+
+GDB is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GDB is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#define GDBINIT_FILENAME ".vxgdbinit"
+
+#define DEFAULT_PROMPT "(vxgdb) "
+
+/* Kludge... */
+#include "tm-sun3.h"
+
+/* We have more complex, useful breakpoints on the target. */
+#undef DECR_PC_AFTER_BREAK
+#define DECR_PC_AFTER_BREAK 0
+
+/* We are guaranteed to have a zero frame pointer at bottom of stack, too. */
+#undef FRAME_CHAIN
+#undef FRAME_CHAIN_VALID
+
+/* Takes the current frame-struct pointer and returns the chain-pointer
+ to get to the calling frame.
+
+ If our current frame pointer is zero, we're at the top; else read out
+ the saved FP from memory pointed to by the current FP. */
+
+#define FRAME_CHAIN(thisframe) ((thisframe)->frame? read_memory_integer ((thisframe)->frame, 4): 0)
+
+/* If the chain pointer is zero (either because the saved value fetched
+ by FRAME_CHAIN was zero, or because the current FP was zero so FRAME_CHAIN
+ never fetched anything), we are at the top of the stack. */
+
+#define FRAME_CHAIN_VALID(chain, thisframe) (chain != 0)